File: vasprintf.c

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/* 
* Copyright (C) 2009 Toni Gundogdu.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

int
vasprintf(char **dst, const char *fmt, va_list ap) {
    va_list apc;
    int len;
    char *p;

    va_copy(apc,ap);
    len = vsnprintf(0,0,fmt,apc)+1;
    va_end(apc);

    *dst = p = malloc(len);
    if (!p)
        return (-1);

    return (vsnprintf(p,len,fmt,ap));
}